Detection of 13.8 dB squeezed vacuum states by optimizing the interference efficiency and gain of balanced homodyne detection

Sun, Xiaojie; Wang, Yajun; Liang, Tian; Zheng, Yaohui; Peng, Kunchi

doi:10.3788/col201917.072701

Cited by 21 publications

(3 citation statements)

References 28 publications

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“…The best squeezing factor, recorded by a spectrum analyzer (FSW8 with 0.2 dB uncertainty, Rohde & Schwarz, Germany) was 11.6 dB at the analysis frequency of 2 MHz. The total LO power before the beamsplitter was 5.5 mW, corresponding to the dark noise clearance of 28 dB [49]. Subsequently, we repeated the above measurement with the locking beam power of 50 mW, corresponding to the quantum noise reduction of 10 dB.…”

Section: Experimental Process and Resultsmentioning

confidence: 99%

Utilizing Sequential Control Scheme to Stabilize Squeezed Vacuum States

et al. 2019

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We report on a sequential control scheme to realize a steady, quasi-continuous output of squeezed vacuum states, which eliminates the influence of the seed beam on the squeezing strength. The scheme, originating from time-division multiplexing, separates the generation process from the locking process. We confirm that the sequential control scheme does not reduce the squeezing strength and that the setup operates stably for a 3-h running test, with a duty ratio of 80% and cycle time of 5 s. Therefore, the sequential control scheme opens up a new path of manipulating squeezed vacuum states.

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Section: Experimental Process and Resultsmentioning

confidence: 99%

Utilizing Sequential Control Scheme to Stabilize Squeezed Vacuum States

et al. 2019

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“…Here, 12 dB-entangled EPR beams are experimentally produced by combining two independent squeezed beams at a 50/50 beam splitter, with the relative phase π/2 actively servo-controlled (see Supporting Information [25] for more details). 13.8 dB squeezed vacuum states of light are produced by OPOs [41], where the semi-monolithic single-resonant standing wave cavity is formed by a piezo-actuated concave mirror and the back surface of a periodically poled KTiOPO 4 (PPKTP) crystal with a dimension of 1mm×2mm×10mm [42]. In addition, to verify the universality of the squeezing gate reported here, one has to create the input states located at arbitrary location of the phase space, and this is realized by modulating the fundamental beam at 3 MHz sideband frequency using an electro-optical phase and amplitude modulators.…”

Section: Quantum Protocolmentioning

confidence: 99%

Deterministic and universal quantum squeezing gate in virtue of teleportation-like protocol

Sun,

Wang,

Tian

et al. 2022

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Squeezing transformation as an essential component, gives rise to the possibility to perform various tasks of quantum information processing. However, the reported squeezing gate with best performance so far is a conditional realization at the expense of low success probability, while the performance of the deterministic ones is currently circumscribed by the limited squeezing degree of the non-classical ancilla. To address this issue, we develop and demonstrate a new scheme of deterministic and universal quantum squeezing gate with the property of non-local operation attributed to the teleportation-like protocol. We demonstrate high fidelity squeezing operation, even when the level of target squeezing being up to 10 dB, where a squeezed state with non-classical noise reduction of 6.5 dB is directly observed. Moreover, we perform a high-fidelity complex operation including a Fourier transformation and a phase squeezing gate, exploring the potential of implementing the complex task of quantum information processing with the presented functional unit. Our method can be applied to distributed quantum processor, the creation of exotic non-classical states, and quantum error correction.

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“…杨文海等人 [12] 于2017 年利用光学参量放大器(optical parametric amplifier, OPA) 获得了12.6 dB 的明亮压缩态光场. 2019 年, Sun 等人 [13] 利用OPO 获得了13.8 dB 压缩真空态光场. 目前实验中观测到的最高压缩度由Schnabel 小组 [14] 保持, 他们利用一个由PPKTP 晶体构建的半整块OPO 获得1064 nm 压缩真空光, 将压缩真空光注入定制的高量子效率(99.5%) 光电探测器中, 测得15 dB 压缩.…”

Section: 引言unclassified